阅读说明：本技术 一种核反应堆控制棒环链生产方法 (Production method of nuclear reactor control rod loop chain ) 是由 张顺强 于章英 于 2021-08-11 设计创作，主要内容包括：本发明属于环链生产技术领域,公开了一种核反应堆控制棒环链生产方法,包括如下步骤：S1.选材：控制棒环链所使用的材料为镍基合金杆材,且所述镍基合金杆材中的强化元素包含钼和铌；S2.编链：将编链模具安装于全自动编链机上,对所述步骤S1中选取的镍基合金杆材进行自动编链及自动打坡口；S3.焊接：采用焊接机对所述步骤S2中所形成的坡口进行自动焊接,并采用自动去刺装置去除焊接完成后的焊缝处的焊疤,获得粗环链；S4.矫形：采用拉力机对所述粗环链进行自动矫形；S5.环链固溶退火处理：在1000-1200℃的温度下保温固溶,并在保温20min后立即水冷；S6.抛光：采用抛光机对经所述步骤S5处理后的粗环链进行自动抛光,获得成品精环链。(The invention belongs to the technical field of ring chain production, and discloses a nuclear reactor control rod ring chain production method, which comprises the following steps: s1, selecting materials: the material used by the control rod ring chain is a nickel-based alloy rod material, and the strengthening elements in the nickel-based alloy rod material comprise molybdenum and niobium; s2, chaining: mounting a chaining mold on a full-automatic chaining machine, and automatically chaining and beveling the nickel-based alloy rod material selected in the step S1; s3, welding: automatically welding the groove formed in the step S2 by using a welding machine, and removing a crater at the welded seam by using an automatic deburring device to obtain a coarse loop chain; s4, reshaping: automatically reshaping the coarse loop chain by adopting a tensile machine; s5, ring chain solution annealing treatment: preserving heat at the temperature of 1000-1200 ℃ for solid solution, and immediately cooling by water after preserving heat for 20 min; s6, polishing: and automatically polishing the coarse ring chain processed in the step S5 by using a polishing machine to obtain a finished product of the fine ring chain.)

1. A method for producing a nuclear reactor control rod chain comprises the following steps:

s1, selecting materials: the material used by the control rod ring chain is a nickel-based alloy rod material, and the strengthening elements in the nickel-based alloy rod material comprise molybdenum and niobium;

s2, chaining: mounting a chaining mold on a full-automatic chaining machine, and automatically chaining and beveling the nickel-based alloy rod material selected in the step S1;

s3, welding: automatically welding the groove formed in the step S2 by using a welding machine, and removing a crater at the welded seam by using an automatic deburring device to obtain a coarse loop chain;

s4, reshaping: automatically reshaping the coarse loop chain by adopting a tensile machine;

s5, ring chain solution annealing treatment: preserving heat at the temperature of 1000-1200 ℃ for solid solution, and immediately cooling by water after preserving heat for 20 min;

s6, polishing: and automatically polishing the coarse ring chain processed in the step S5 by using a polishing machine to obtain a finished product of the fine ring chain.

2. The method of claim 1, further comprising, prior to performing the chaining in step S2:

s11, carrying out solution annealing treatment on the nickel-based alloy rod material selected in the step S1.

3. The nuclear reactor control rod loop chain production method of claim 1, wherein in the chaining of step S2, the chaining mold is made of W18Cr 4V.

4. The method for producing a nuclear reactor control rod loop chain as claimed in claim 1, wherein in the chaining of step S2, when performing automatic beveling:

the groove is positioned in the middle of the chain segment, and the width of the groove is not more than 5 mm;

the section of the groove is double V-shaped, and the included angle of one V shape is 38 degrees.

5. The method as claimed in claim 1, wherein the deburring tool of the automatic deburring device is made of powder metallurgy steel A60 in the welding of step S3.

6. The nuclear reactor control rod loop chain production method of claim 1, wherein in the reshaping of step S4, the reshaping pull force is not less than 60 KN.

7. The method as claimed in claim 1, wherein the temperature maintaining and solutionizing temperature in the ring chain solution annealing treatment of step S5 is 1100 ℃ ± 20 ℃.

8. The nuclear reactor control rod loop chain production method as set forth in claim 1, further comprising, before performing the polishing in step S6:

and S51, carrying out nondestructive detection on the coarse loop chain processed in the step S5, and carrying out polishing in the step S6 after a detection result meets a set requirement.

9. The method as claimed in claim 1, wherein a brightening agent which does not react with the coarse ring chain is added during the polishing in step S6.

10. The nuclear reactor control rod loop chain production method as set forth in claim 1, further comprising, after performing the polishing in the step S6:

s61, cleaning the finished product precision loop chain by using clear water.

Technical Field

The invention belongs to the technical field of ring chain production, and particularly relates to a method for producing a nuclear reactor control rod ring chain.

Background

The nuclear power link chain is a key component of the control rod drive mechanism. At present, most of the traditional chain is made of stainless steel 304 or 316, so that the surface hardness of the formed chain is less than HRC20, the corrosion resistance and the wear resistance of the formed chain are insufficient, and the formed chain is easy to wear in the long-time use process, so that the problems of chain pitch lengthening, chain jumping, chain jamming and the like are caused; in addition, in the traditional loop chain knitting process, manual argon arc welding without beveling or manual argon arc welding with beveling is mostly adopted for welding, but the manual welding is greatly influenced by human factors, the bonding force of a welding line is difficult to ensure, and the breaking tension of a formed loop chain is further influenced.

Disclosure of Invention

In view of the above, the present invention is directed to a method for producing a nuclear reactor control rod chain.

In order to achieve the purpose, the invention provides the following technical scheme: a method of producing a nuclear reactor control rod chain loop, comprising the steps of:

s1, selecting materials: the material used by the control rod ring chain is a nickel-based alloy rod material, and the strengthening elements in the nickel-based alloy rod material comprise molybdenum and niobium;

s2, chaining: mounting a chaining mold on a full-automatic chaining machine, and automatically chaining and beveling the nickel-based alloy rod material selected in the step S1;

s3, welding: automatically welding the groove formed in the step S2 by using a welding machine, and removing a crater at the welded seam by using an automatic deburring device to obtain a coarse loop chain;

s4, reshaping: automatically reshaping the coarse loop chain by adopting a tensile machine;

s5, ring chain solution annealing treatment: preserving heat at the temperature of 1000-1200 ℃ for solid solution, and immediately cooling by water after preserving heat for 20 min;

s6, polishing: and automatically polishing the coarse ring chain processed in the step S5 by using a polishing machine to obtain a finished product of the fine ring chain.

Preferably, before performing the chaining in step S2, the method further includes: s11, carrying out solution annealing treatment on the nickel-based alloy rod material selected in the step S1.

Preferably, in the chaining of the step S2, the chaining mold is made of W18Cr 4V.

Preferably, in the chaining in step S2, when automatic beveling is performed:

the groove is positioned in the middle of the chain segment, and the width of the groove is not more than 5 mm; the section of the groove is double V-shaped, and the included angle of one V shape is 38 degrees.

Preferably, in the welding of step S3, the deburring tool of the automatic deburring device is made of powder metallurgy steel a 60.

Preferably, in the orthopedic procedure of step S4, the orthopedic tension is not lower than 60 KN.

Preferably, in the ring-chain solution treatment of step S5, the temperature of the solution is 1100 ℃ ± 20 ℃.

Preferably, before the polishing in step S6 is performed, the method further includes: and S51, carrying out nondestructive detection on the coarse loop chain processed in the step S5, and carrying out polishing in the step S6 after a detection result meets a set requirement.

Preferably, a brightener that does not react with the coarse ring chain is added during the polishing in step S6.

Preferably, after the polishing in step S6 is performed, the method further includes: s61, cleaning the finished product precision loop chain by using clear water.

Compared with the prior art, the invention has the following beneficial effects:

in the method, the nickel-based alloy rod material which takes molybdenum and niobium as main strengthening elements is selected as the raw material of the control rod ring chain, so that the hardness, the corrosion resistance, the wear resistance and the tensile strength of the finished product precision ring chain can be effectively ensured to be improved, and the service life of the finished product precision ring chain is prolonged;

in addition, the method adopts full-automatic chain knitting, beveling and welding operation, so that the finished product precision ring chain prepared by the method can be produced in large batch, the breaking tension can reach more than 70 grades, and the method has the advantages of ring specification, good size and bevel consistency and high precision.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A method of producing a nuclear reactor control rod chain loop, comprising the steps of:

s1, selecting materials: the material used by the control rod ring chain is a nickel-based alloy rod material, and the nickel-based alloy rod material takes molybdenum and niobium as main strengthening elements; specifically, the method comprises the following steps: the selected rod material is preferably phi 10 nickel-based alloy made of UNS N06625, and the selected nickel-based alloy rod material is subjected to solution annealing treatment;

s2, chaining: mounting the chaining mold on a full-automatic chaining machine, and automatically chaining and beveling the nickel-based alloy rod material selected in the step S1; specifically, the method comprises the following steps: the chaining mold is made of W18Cr 4V; the groove is positioned in the middle of the chain segment, and the width of the groove is not more than 5 mm; the section of the groove is double V-shaped, and one V-shaped included angle is 38 degrees;

s3, welding: automatically welding the groove formed in the step S2 by using a welding machine, and removing a crater at the welded joint by using an automatic deburring device to obtain a coarse loop chain; specifically, the method comprises the following steps: the welding machine is preferably XSh200 (nickel-based) welding equipment, and a deburring cutter in the automatic deburring device is made of powder metallurgy steel A60;

s4, reshaping: automatically correcting the coarse loop chain by adopting a tensile machine; specifically, the method comprises the following steps: adopting a JYX-20T tensile machine, wherein the orthopedic tensile force is not lower than 60 KN;

s5, ring chain solution annealing treatment: preserving heat at the temperature of 1100 +/-20 ℃ for solid solution, and immediately cooling by water after preserving heat for 20 min;

s51, performing nondestructive detection on the coarse loop chain processed in the step S5, and entering a step S6 when a detection result meets a set requirement; specifically, the method comprises the following steps: in the nondestructive detection process, surface defects such as scratches, air holes, cracks and the like of the coarse loop chain are detected, and the set requirements are met when no surface defects exist;

s6, polishing: automatically polishing the coarse ring chain processed in the step S5 by using a polishing machine to obtain a finished product of a fine ring chain; specifically, the method comprises the following steps: adding a brightening agent which does not react with the coarse chain, and cleaning the finished fine chain by using clear water after polishing.

In conclusion, the nickel-based alloy rod material is used for replacing the traditional stainless steel 304 or 316 material, so that the surface hardness, the corrosion resistance, the wear resistance and the tensile strength of the finished product precision loop chain can be effectively improved, and the service life of the finished product precision loop chain is prolonged. In addition, the method is fully automatically operated, and can effectively ensure that the finished product precision ring chain has the advantages of standard ring shape, good size and groove consistency and high precision.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.